CFD Modeling of Airflow in a Livestock Building

Li Rong, B. Elhadidi, H. E. Khalifa, Peter V. Nielsen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

9 Citations (Scopus)
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Abstract

In this paper, a 2D simulation for a typical livestock building is performed to assess the ammonia emission removal rate to the atmosphere. Two geometry models are used and compared in order to represent the slatted floor. In the first model the floor is modeled as a slatted floor and in the second model the traditional porous media is used. The results show that the porous floor modeling over predicts the ammonia emission by a factor of 2 compared to the slatted floor modeling. The results also show different velocity distribution under slatted floor. This suggests that modeling the slatted floor as openings or slats is necessary even though it will result in an increased computational cost. To reduce the number of grid points needed, a multi-domain mesh is used with variable resolution cells in each domain. Interface conditions are used along the boundaries of the adjacent domain. After exploring the accuracy of the porous jump assumption by comparing the velocity, and ammonia concentration in a 2D simulation, heated solid bodies are added to represent the livestock in the following simulations. The results of simulations with heat source also indicate that modeling the slatted floor with slats is necessary. Furthermore, the combination of low inlet velocity and heated objects causes the flow to be buoyancy dominated and unsteady. This unsteadiness can be common in similar buoyancy induced flows for high Rayleigh number flow. The paper concludes with tradeoffs suggested for simulation of livestock buildings.
Original languageEnglish
Title of host publicationIAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings : August 15-18, 2010, Syracuse, New York, USA
Number of pages8
Place of PublicationSyracuse, New York
PublisherThe 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
Publication date2010
Publication statusPublished - 2010
EventThe 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings - Syracuse, New York, United States
Duration: 15 Aug 201018 Aug 2010

Conference

ConferenceThe 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
CountryUnited States
CitySyracuse, New York
Period15/08/201018/08/2010

Fingerprint

Agriculture
Computational fluid dynamics
Ammonia
Buoyancy
Velocity distribution
Porous materials
Geometry
Costs

Keywords

  • CDF Modeling
  • Airflow
  • Livestock Building

Cite this

Rong, L., Elhadidi, B., Khalifa, H. E., & Nielsen, P. V. (2010). CFD Modeling of Airflow in a Livestock Building. In IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: August 15-18, 2010, Syracuse, New York, USA Syracuse, New York: The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
Rong, Li ; Elhadidi, B. ; Khalifa, H. E. ; Nielsen, Peter V. / CFD Modeling of Airflow in a Livestock Building. IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: August 15-18, 2010, Syracuse, New York, USA. Syracuse, New York : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, 2010.
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abstract = "In this paper, a 2D simulation for a typical livestock building is performed to assess the ammonia emission removal rate to the atmosphere. Two geometry models are used and compared in order to represent the slatted floor. In the first model the floor is modeled as a slatted floor and in the second model the traditional porous media is used. The results show that the porous floor modeling over predicts the ammonia emission by a factor of 2 compared to the slatted floor modeling. The results also show different velocity distribution under slatted floor. This suggests that modeling the slatted floor as openings or slats is necessary even though it will result in an increased computational cost. To reduce the number of grid points needed, a multi-domain mesh is used with variable resolution cells in each domain. Interface conditions are used along the boundaries of the adjacent domain. After exploring the accuracy of the porous jump assumption by comparing the velocity, and ammonia concentration in a 2D simulation, heated solid bodies are added to represent the livestock in the following simulations. The results of simulations with heat source also indicate that modeling the slatted floor with slats is necessary. Furthermore, the combination of low inlet velocity and heated objects causes the flow to be buoyancy dominated and unsteady. This unsteadiness can be common in similar buoyancy induced flows for high Rayleigh number flow. The paper concludes with tradeoffs suggested for simulation of livestock buildings.",
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Rong, L, Elhadidi, B, Khalifa, HE & Nielsen, PV 2010, CFD Modeling of Airflow in a Livestock Building. in IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: August 15-18, 2010, Syracuse, New York, USA. The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, Syracuse, New York, The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, Syracuse, New York, United States, 15/08/2010.

CFD Modeling of Airflow in a Livestock Building. / Rong, Li; Elhadidi, B.; Khalifa, H. E.; Nielsen, Peter V.

IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: August 15-18, 2010, Syracuse, New York, USA. Syracuse, New York : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, 2010.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - CFD Modeling of Airflow in a Livestock Building

AU - Rong, Li

AU - Elhadidi, B.

AU - Khalifa, H. E.

AU - Nielsen, Peter V.

PY - 2010

Y1 - 2010

N2 - In this paper, a 2D simulation for a typical livestock building is performed to assess the ammonia emission removal rate to the atmosphere. Two geometry models are used and compared in order to represent the slatted floor. In the first model the floor is modeled as a slatted floor and in the second model the traditional porous media is used. The results show that the porous floor modeling over predicts the ammonia emission by a factor of 2 compared to the slatted floor modeling. The results also show different velocity distribution under slatted floor. This suggests that modeling the slatted floor as openings or slats is necessary even though it will result in an increased computational cost. To reduce the number of grid points needed, a multi-domain mesh is used with variable resolution cells in each domain. Interface conditions are used along the boundaries of the adjacent domain. After exploring the accuracy of the porous jump assumption by comparing the velocity, and ammonia concentration in a 2D simulation, heated solid bodies are added to represent the livestock in the following simulations. The results of simulations with heat source also indicate that modeling the slatted floor with slats is necessary. Furthermore, the combination of low inlet velocity and heated objects causes the flow to be buoyancy dominated and unsteady. This unsteadiness can be common in similar buoyancy induced flows for high Rayleigh number flow. The paper concludes with tradeoffs suggested for simulation of livestock buildings.

AB - In this paper, a 2D simulation for a typical livestock building is performed to assess the ammonia emission removal rate to the atmosphere. Two geometry models are used and compared in order to represent the slatted floor. In the first model the floor is modeled as a slatted floor and in the second model the traditional porous media is used. The results show that the porous floor modeling over predicts the ammonia emission by a factor of 2 compared to the slatted floor modeling. The results also show different velocity distribution under slatted floor. This suggests that modeling the slatted floor as openings or slats is necessary even though it will result in an increased computational cost. To reduce the number of grid points needed, a multi-domain mesh is used with variable resolution cells in each domain. Interface conditions are used along the boundaries of the adjacent domain. After exploring the accuracy of the porous jump assumption by comparing the velocity, and ammonia concentration in a 2D simulation, heated solid bodies are added to represent the livestock in the following simulations. The results of simulations with heat source also indicate that modeling the slatted floor with slats is necessary. Furthermore, the combination of low inlet velocity and heated objects causes the flow to be buoyancy dominated and unsteady. This unsteadiness can be common in similar buoyancy induced flows for high Rayleigh number flow. The paper concludes with tradeoffs suggested for simulation of livestock buildings.

KW - CDF Modeling

KW - Airflow

KW - Livestock Building

KW - CDF Modeling

KW - Airflow

KW - Livestock Building

M3 - Article in proceeding

BT - IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings

PB - The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings

CY - Syracuse, New York

ER -

Rong L, Elhadidi B, Khalifa HE, Nielsen PV. CFD Modeling of Airflow in a Livestock Building. In IAQVEC 2010 : The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: August 15-18, 2010, Syracuse, New York, USA. Syracuse, New York: The 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. 2010